marketplace

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An open area or square in a town where a public market or sale is set up.
• noun The world of business and commerce.
• noun A situation or place in which values, opinions, and ideas are put forward for debate or recognition.

from The Century Dictionary.

• noun The place in which a market is held, usually an open space in a town set apart for the holding of markets.

from the GNU version of the Collaborative International Dictionary of English.

• noun an area in a town where a public market is set up; a market place; a market{2}.
• noun The commercial activity whereby good and services are exchanged.
• noun The mechanism by which one finds a person to whom to sell or from whom to buy goods; the opportunity to buy and sell; a market{3}.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An open area in a town housing a public market.
• noun The space, actual or metaphorical, in which a market operates.
• noun by extension The world of commerce and trade.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the world of commercial activity where goods and services are bought and sold
• noun an area in a town where a public mercantile establishment is set up
• noun an area in a town where a public mercantile establishment is set up
• noun the world of commercial activity where goods and services are bought and sold